PlanetHop! spent literally months and months researching – basically the entire world – to identify the most interesting and exciting destinations on the planet. While we don't publicize it, we do have our own special Top 10 destinations that no self-respecting PlanetHopper! can possibly overlook. Coming in at a respectable #7 is Stonehenge. Why so high? Simple, it's ancient (estimates are that it was constructed at least 4,000 years ago). It's a recognizable icon around the world, whether you're in the most remote reaches of Africa or the bazaars of the Middle East. It's easily accessible from one of the…